Realize this is a bit old but I was digging around for the same info. I'm wondering the same thing in general (any console really). There's got to be a way. I'm surprised no one's answered you. Did you ever get to the bottom of it?

PS2 only does 480i (except for a few games that do 480p). Most monitors dont support 480i. You need something that converts the 480i to 480p, which is going to be more expensive than the things for wii/ps3/360 which dont have to deal with 480i since they all fully support 480p or better.

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